Hi,
Not knowing what the damage was previously, I would have expected the vendor to acknowledge the repair (coloring) was going to be much different and given you the option. Since it appears, you tried to contact him to "make it right" and received no response, then, your only recourse is post your experience. If they are "listening" this may flush them out of the their hole.
I'm assuming there was no discussion on the course of action for the repair?